31013431 has 2 divisors, whose sum is σ = 31013432. Its totient is φ = 31013430.

The previous prime is 31013419. The next prime is 31013461. The reversal of 31013431 is 13431013.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31013431 - 2⁵ = 31013399 is a prime.

It is a super-2 number, since 2×31013431² = 1923665804783522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31013401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15506715 + 15506716.

It is an arithmetic number, because the mean of its divisors is an integer number (15506716).

Almost surely, 2^31013431 is an apocalyptic number.

31013431 is a deficient number, since it is larger than the sum of its proper divisors (1).

31013431 is an equidigital number, since it uses as much as digits as its factorization.

31013431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 31013431 is about 5568.9703716217. The cubic root of 31013431 is about 314.1834263055.

Adding to 31013431 its reverse (13431013), we get a palindrome (44444444).

The spelling of 31013431 in words is "thirty-one million, thirteen thousand, four hundred thirty-one".